use the derivedrp avaiable https://github.com/FPtje/DarkRP/releases/tag/derived
Proceed to edit the foldername to militaaryrp
then inside the folde rrename the .txt file to militaryrp then edit that file and set title to MilitaryRP now almost done we go into gamemode folder then init.lua and change gm.name to militaryrp and do the saem to cl_init.lua

ta da you are done just put that derivedrp into your gamemode folder and its now your new gamemode make sure when you set your gamemode in startup or chaangelevel gammode its all lowercase militaryrp